Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 409 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/uchan.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/uchan.c
new file mode 100644
index 000000000..1dac95ae7
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/uchan.c
@@ -0,0 +1,409 @@
+/*
+ * Copyright 2021 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+#define nvkm_uchan(p) container_of((p), struct nvkm_uchan, object)
+#include "priv.h"
+#include "cgrp.h"
+#include "chan.h"
+#include "chid.h"
+#include "runl.h"
+
+#include <core/gpuobj.h>
+#include <core/oproxy.h>
+#include <subdev/mmu.h>
+#include <engine/dma.h>
+
+#include <nvif/if0020.h>
+
+struct nvkm_uchan {
+	struct nvkm_object object;
+	struct nvkm_chan *chan;
+};
+
+static int
+nvkm_uchan_uevent(struct nvkm_object *object, void *argv, u32 argc, struct nvkm_uevent *uevent)
+{
+	struct nvkm_chan *chan = nvkm_uchan(object)->chan;
+	struct nvkm_runl *runl = chan->cgrp->runl;
+	union nvif_chan_event_args *args = argv;
+
+	if (!uevent)
+		return 0;
+	if (argc != sizeof(args->v0) || args->v0.version != 0)
+		return -ENOSYS;
+
+	switch (args->v0.type) {
+	case NVIF_CHAN_EVENT_V0_NON_STALL_INTR:
+		return nvkm_uevent_add(uevent, &runl->fifo->nonstall.event, 0,
+				       NVKM_FIFO_NONSTALL_EVENT, NULL);
+	case NVIF_CHAN_EVENT_V0_KILLED:
+		return nvkm_uevent_add(uevent, &runl->chid->event, chan->id,
+				       NVKM_CHAN_EVENT_ERRORED, NULL);
+	default:
+		break;
+	}
+
+	return -ENOSYS;
+}
+
+struct nvkm_uobj {
+	struct nvkm_oproxy oproxy;
+	struct nvkm_chan *chan;
+	struct nvkm_cctx *cctx;
+	int hash;
+};
+
+static int
+nvkm_uchan_object_fini_1(struct nvkm_oproxy *oproxy, bool suspend)
+{
+	struct nvkm_uobj *uobj = container_of(oproxy, typeof(*uobj), oproxy);
+	struct nvkm_chan *chan = uobj->chan;
+	struct nvkm_cctx *cctx = uobj->cctx;
+	struct nvkm_ectx *ectx = cctx->vctx->ectx;
+
+	if (!ectx->object)
+		return 0;
+
+	/* Unbind engine context from channel, if no longer required. */
+	if (refcount_dec_and_mutex_lock(&cctx->uses, &chan->cgrp->mutex)) {
+		nvkm_chan_cctx_bind(chan, ectx->engn, NULL);
+
+		if (refcount_dec_and_test(&ectx->uses))
+			nvkm_object_fini(ectx->object, false);
+		mutex_unlock(&chan->cgrp->mutex);
+	}
+
+	return 0;
+}
+
+static int
+nvkm_uchan_object_init_0(struct nvkm_oproxy *oproxy)
+{
+	struct nvkm_uobj *uobj = container_of(oproxy, typeof(*uobj), oproxy);
+	struct nvkm_chan *chan = uobj->chan;
+	struct nvkm_cctx *cctx = uobj->cctx;
+	struct nvkm_ectx *ectx = cctx->vctx->ectx;
+	int ret = 0;
+
+	if (!ectx->object)
+		return 0;
+
+	/* Bind engine context to channel, if it hasn't been already. */
+	if (!refcount_inc_not_zero(&cctx->uses)) {
+		mutex_lock(&chan->cgrp->mutex);
+		if (!refcount_inc_not_zero(&cctx->uses)) {
+			if (!refcount_inc_not_zero(&ectx->uses)) {
+				ret = nvkm_object_init(ectx->object);
+				if (ret == 0)
+					refcount_set(&ectx->uses, 1);
+			}
+
+			if (ret == 0) {
+				nvkm_chan_cctx_bind(chan, ectx->engn, cctx);
+				refcount_set(&cctx->uses, 1);
+			}
+		}
+		mutex_unlock(&chan->cgrp->mutex);
+	}
+
+	return ret;
+}
+
+static void
+nvkm_uchan_object_dtor(struct nvkm_oproxy *oproxy)
+{
+	struct nvkm_uobj *uobj = container_of(oproxy, typeof(*uobj), oproxy);
+	struct nvkm_engn *engn;
+
+	if (!uobj->cctx)
+		return;
+
+	engn = uobj->cctx->vctx->ectx->engn;
+	if (engn->func->ramht_del)
+		engn->func->ramht_del(uobj->chan, uobj->hash);
+
+	nvkm_chan_cctx_put(uobj->chan, &uobj->cctx);
+}
+
+static const struct nvkm_oproxy_func
+nvkm_uchan_object = {
+	.dtor[1] = nvkm_uchan_object_dtor,
+	.init[0] = nvkm_uchan_object_init_0,
+	.fini[1] = nvkm_uchan_object_fini_1,
+};
+
+static int
+nvkm_uchan_object_new(const struct nvkm_oclass *oclass, void *argv, u32 argc,
+		      struct nvkm_object **pobject)
+{
+	struct nvkm_chan *chan = nvkm_uchan(oclass->parent)->chan;
+	struct nvkm_cgrp *cgrp = chan->cgrp;
+	struct nvkm_engn *engn;
+	struct nvkm_uobj *uobj;
+	int ret;
+
+	/* Lookup host engine state for target engine. */
+	engn = nvkm_runl_find_engn(engn, cgrp->runl, engn->engine == oclass->engine);
+	if (WARN_ON(!engn))
+		return -EINVAL;
+
+	/* Allocate SW object. */
+	if (!(uobj = kzalloc(sizeof(*uobj), GFP_KERNEL)))
+		return -ENOMEM;
+
+	nvkm_oproxy_ctor(&nvkm_uchan_object, oclass, &uobj->oproxy);
+	uobj->chan = chan;
+	*pobject = &uobj->oproxy.base;
+
+	/* Ref. channel context for target engine.*/
+	ret = nvkm_chan_cctx_get(chan, engn, &uobj->cctx, oclass->client);
+	if (ret)
+		return ret;
+
+	/* Allocate HW object. */
+	ret = oclass->base.ctor(&(const struct nvkm_oclass) {
+					.base = oclass->base,
+					.engn = oclass->engn,
+					.handle = oclass->handle,
+					.object = oclass->object,
+					.client = oclass->client,
+					.parent = uobj->cctx->vctx->ectx->object ?: oclass->parent,
+					.engine = engn->engine,
+				 }, argv, argc, &uobj->oproxy.object);
+	if (ret)
+		return ret;
+
+	if (engn->func->ramht_add) {
+		uobj->hash = engn->func->ramht_add(engn, uobj->oproxy.object, uobj->chan);
+		if (uobj->hash < 0)
+			return uobj->hash;
+	}
+
+	return 0;
+}
+
+static int
+nvkm_uchan_sclass(struct nvkm_object *object, int index, struct nvkm_oclass *oclass)
+{
+	struct nvkm_chan *chan = nvkm_uchan(object)->chan;
+	struct nvkm_engn *engn;
+	int ret, runq = 0;
+
+	nvkm_runl_foreach_engn(engn, chan->cgrp->runl) {
+		struct nvkm_engine *engine = engn->engine;
+		int c = 0;
+
+		/* Each runqueue, on runlists with multiple, has its own LCE. */
+		if (engn->runl->func->runqs) {
+			if (engine->subdev.type == NVKM_ENGINE_CE) {
+				if (chan->runq != runq++)
+					continue;
+			}
+		}
+
+		oclass->engine = engine;
+		oclass->base.oclass = 0;
+
+		if (engine->func->fifo.sclass) {
+			ret = engine->func->fifo.sclass(oclass, index);
+			if (oclass->base.oclass) {
+				if (!oclass->base.ctor)
+					oclass->base.ctor = nvkm_object_new;
+				oclass->ctor = nvkm_uchan_object_new;
+				return 0;
+			}
+
+			index -= ret;
+			continue;
+		}
+
+		while (engine->func->sclass[c].oclass) {
+			if (c++ == index) {
+				oclass->base = engine->func->sclass[index];
+				if (!oclass->base.ctor)
+					oclass->base.ctor = nvkm_object_new;
+				oclass->ctor = nvkm_uchan_object_new;
+				return 0;
+			}
+		}
+
+		index -= c;
+	}
+
+	return -EINVAL;
+}
+
+static int
+nvkm_uchan_map(struct nvkm_object *object, void *argv, u32 argc,
+	       enum nvkm_object_map *type, u64 *addr, u64 *size)
+{
+	struct nvkm_chan *chan = nvkm_uchan(object)->chan;
+	struct nvkm_device *device = chan->cgrp->runl->fifo->engine.subdev.device;
+
+	if (chan->func->userd->bar < 0)
+		return -ENOSYS;
+
+	*type = NVKM_OBJECT_MAP_IO;
+	*addr = device->func->resource_addr(device, chan->func->userd->bar) +
+		chan->func->userd->base + chan->userd.base;
+	*size = chan->func->userd->size;
+	return 0;
+}
+
+static int
+nvkm_uchan_fini(struct nvkm_object *object, bool suspend)
+{
+	struct nvkm_chan *chan = nvkm_uchan(object)->chan;
+
+	nvkm_chan_block(chan);
+	nvkm_chan_remove(chan, true);
+
+	if (chan->func->unbind)
+		chan->func->unbind(chan);
+
+	return 0;
+}
+
+static int
+nvkm_uchan_init(struct nvkm_object *object)
+{
+	struct nvkm_chan *chan = nvkm_uchan(object)->chan;
+
+	if (atomic_read(&chan->errored))
+		return 0;
+
+	if (chan->func->bind)
+		chan->func->bind(chan);
+
+	nvkm_chan_allow(chan);
+	nvkm_chan_insert(chan);
+	return 0;
+}
+
+static void *
+nvkm_uchan_dtor(struct nvkm_object *object)
+{
+	struct nvkm_uchan *uchan = nvkm_uchan(object);
+
+	nvkm_chan_del(&uchan->chan);
+	return uchan;
+}
+
+static const struct nvkm_object_func
+nvkm_uchan = {
+	.dtor = nvkm_uchan_dtor,
+	.init = nvkm_uchan_init,
+	.fini = nvkm_uchan_fini,
+	.map = nvkm_uchan_map,
+	.sclass = nvkm_uchan_sclass,
+	.uevent = nvkm_uchan_uevent,
+};
+
+int
+nvkm_uchan_new(struct nvkm_fifo *fifo, struct nvkm_cgrp *cgrp, const struct nvkm_oclass *oclass,
+	       void *argv, u32 argc, struct nvkm_object **pobject)
+{
+	union nvif_chan_args *args = argv;
+	struct nvkm_runl *runl;
+	struct nvkm_vmm *vmm = NULL;
+	struct nvkm_dmaobj *ctxdma = NULL;
+	struct nvkm_memory *userd = NULL;
+	struct nvkm_uchan *uchan;
+	struct nvkm_chan *chan;
+	int ret;
+
+	if (argc < sizeof(args->v0) || args->v0.version != 0)
+		return -ENOSYS;
+	argc -= sizeof(args->v0);
+
+	if (args->v0.namelen != argc)
+		return -EINVAL;
+
+	/* Lookup objects referenced in args. */
+	runl = nvkm_runl_get(fifo, args->v0.runlist, 0);
+	if (!runl)
+		return -EINVAL;
+
+	if (args->v0.vmm) {
+		vmm = nvkm_uvmm_search(oclass->client, args->v0.vmm);
+		if (IS_ERR(vmm))
+			return PTR_ERR(vmm);
+	}
+
+	if (args->v0.ctxdma) {
+		ctxdma = nvkm_dmaobj_search(oclass->client, args->v0.ctxdma);
+		if (IS_ERR(ctxdma)) {
+			ret = PTR_ERR(ctxdma);
+			goto done;
+		}
+	}
+
+	if (args->v0.huserd) {
+		userd = nvkm_umem_search(oclass->client, args->v0.huserd);
+		if (IS_ERR(userd)) {
+			ret = PTR_ERR(userd);
+			userd = NULL;
+			goto done;
+		}
+	}
+
+	/* Allocate channel. */
+	if (!(uchan = kzalloc(sizeof(*uchan), GFP_KERNEL))) {
+		ret = -ENOMEM;
+		goto done;
+	}
+
+	nvkm_object_ctor(&nvkm_uchan, oclass, &uchan->object);
+	*pobject = &uchan->object;
+
+	ret = nvkm_chan_new_(fifo->func->chan.func, runl, args->v0.runq, cgrp, args->v0.name,
+			     args->v0.priv != 0, args->v0.devm, vmm, ctxdma, args->v0.offset,
+			     args->v0.length, userd, args->v0.ouserd, &uchan->chan);
+	if (ret)
+		goto done;
+
+	chan = uchan->chan;
+
+	/* Return channel info to caller. */
+	if (chan->func->doorbell_handle)
+		args->v0.token = chan->func->doorbell_handle(chan);
+	else
+		args->v0.token = ~0;
+
+	args->v0.chid = chan->id;
+
+	switch (nvkm_memory_target(chan->inst->memory)) {
+	case NVKM_MEM_TARGET_INST: args->v0.aper = NVIF_CHAN_V0_INST_APER_INST; break;
+	case NVKM_MEM_TARGET_VRAM: args->v0.aper = NVIF_CHAN_V0_INST_APER_VRAM; break;
+	case NVKM_MEM_TARGET_HOST: args->v0.aper = NVIF_CHAN_V0_INST_APER_HOST; break;
+	case NVKM_MEM_TARGET_NCOH: args->v0.aper = NVIF_CHAN_V0_INST_APER_NCOH; break;
+	default:
+		WARN_ON(1);
+		ret = -EFAULT;
+		break;
+	}
+
+	args->v0.inst = nvkm_memory_addr(chan->inst->memory);
+done:
+	nvkm_memory_unref(&userd);
+	nvkm_vmm_unref(&vmm);
+	return ret;
+}